Changed pkg option to package-root.

sdk/lib/_internal/dartdoc/lib/dartdoc.dart

Index: sdk/lib/_internal/dartdoc/lib/dartdoc.dart
diff --git a/sdk/lib/_internal/dartdoc/lib/dartdoc.dart b/sdk/lib/_internal/dartdoc/lib/dartdoc.dart
index 18c69e8edee809fc6c78de3be6ec95bf842d32a3..42246b9fcdcedaf6480a5492995b8bee0999bd61 100644
--- a/sdk/lib/_internal/dartdoc/lib/dartdoc.dart
+++ b/sdk/lib/_internal/dartdoc/lib/dartdoc.dart
@@ -403,15 +403,15 @@ class Dartdoc {
     return content;
   }
 
-  Future documentEntryPoint(Path entrypoint, Path libPath, Path pkgPath) {
-    return documentLibraries(<Path>[entrypoint], libPath, pkgPath);
+  Future documentEntryPoint(Path entrypoint, Path libPath, Path packageRoot) {
+    return documentLibraries(<Path>[entrypoint], libPath, packageRoot);
   }
 
-  Future documentLibraries(List<Path> libraryList, Path libPath, Path pkgPath) {
+  Future documentLibraries(List<Path> libraryList, Path libPath, Path packageRoot) {
     // TODO(amouravski): make all of these print statements into logging
     // statements.
     print('Analyzing libraries...');
-    return dart2js.analyze(libraryList, libPath, packageRoot: pkgPath,
+    return dart2js.analyze(libraryList, libPath, packageRoot: packageRoot,
         options: COMPILER_OPTIONS)
       .then((MirrorSystem mirrors) {
         print('Generating documentation...');